IUGO Mobile made Zombie Attack! for the iOS that became quite popular. Now they are making Zombie Attack! Second Wave for the Windows Phone 7 devices. The sequel will have more weapons, more locations and enhanced graphics. Here is more info on this upcoming Windows Phone 7 game:

Lovers of zombies and tower defense-style games combined have a second chance to tear into more zombies with more weapons and in more locations than ever before. IUGO built upon what you loved best about the original Zombie Attack! game making it bigger, better and bloodier! Your mission: play as a survivor from the ultimate Zombie Apocalypse, protect your shack and stay alive. Kill zombies, earn points and cash to upgrade your weapons and bolster your fire power. Easy touch-screen controls make ZA! 2 an instant WP7 favorite.

Zombie Attack Second Wave Features:

* 7 turrets (3 new, including the Pulsewave) * New upgrades to super turrets * 4 maps of varying sizes including Backyard and Trailer Park * Hordes of challenges, 5 for each map * 6 zombie types (4 new, including the Hound and Cheerleader) * Instantaneous save when quitting the app * Online high scores list for each map, local lists for challenges and personal records * IUGO high-quality and polish